Within forty-five days after the end of each month in a calendar year, the public utility taxed hereunder shall file with the city treasurer a report of its gross revenue derived from the sale and use of public utility service in the city as defined in this chapter, together with a computation of the tax levied hereunder against the utility. Coincidental with the filing of such report, the utility shall pay to the city treasurer the amount of the tax due for that calendar month subject to such report. (Ord. 6-15-82B § 1 (part); Code 1975 § 9-301(3))